Boiler



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l No.- 505,543. Patented Septe 25, 18931.

(No Model.) 4 Sheets-Sheet 3.

G. s. STRONG.

BOILER. No. 505,543. Patented sept-zen 1893.

(No M5451.) Y 4 sheetssheet 4.

G. S. STRONG.. BOILEAR.

No. 505,543. Pa-tentedsept. 26, 1893.

54 I n 0,74? Y I 'I' `M UNITED STATES PATENT OFFICE.

GEORGE S. STRONG, OF NEW YORK, N. Y., ASSIGNOR TO JAMES N. GAMBIIE,

OF DAYTONA, FLORIDA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 505,543, dated September 2,6, 1893.

Application filed September 24, 1892. Serial No. 446,766. (No model.)

To a/ZZ whom it may concern: i

Be it known that I, GEORGE S. STRONG, of the city, county, and State of New York,have invented acertain new and useful Improvemeut in Boilers, of which the following is a true and exact description, reference being had tothe accompanying drawings, which form a part of this specification.

My invention relates to the construction of boilers, and partic larly Ato the construction of the lire-boxes an their-immediate connections; my object being `to simplify, cheapen and strengthen the boiler.

My invention relates to the same `class of boilers as described and shown in my Patent No. 466,085 and involvesmany of the features claimed in said patent. By my newtonstruction, however, Iam enabled to construct the nre-box of two sheets of metal formed so as to not only diminish the number of seams, but to materially increase the strength of the boiler, and I also improve the construction of v.the combustion chamber.

line 6 -6 of Fig. 1. Fig. 4. is a cross section i on the line #iw-4. of Fig. 5, and Fig. 5 a longi` tudinal section on the line 5 5- of Fig. 4,

these two figures illustrating the strength-` ening device which it is advisable to use with wide` fire-boxes. Fig. 6 is a cross-sectional elevation illustrating my invention as applied to narrow nre-boxes, and Fig. 7 is a cross-section on the line V7---7 of` Fig. 2.

A indicates the shell of the boiler; I3, being .the steam dome.

the Walls being indicated by the letters O- C .1'

The wallsof myiire-box are corrugated as described in my former patent; but in place of having a separate crown sheet I continue the walls O or Oin an arched form until they meet forming the abutting edges with flanges C2 which together with a metal strip D form Adamsons seams along the tube of the fireboX. The flanges it will be noted are corrugated to correspond with the corrugation of the sheets which by this construction .are continued to-the seam and do not vanish in the dan ge.

In the various forms of lire-boxes shown in the drawings I have illustrated practically the extremes of shapes'which the corrugated and `ianged plates would be required to take to form boththe stays and crown of the tire# box and it will be seen that the shape of the plate in, all cases is such asv would readily permit it to be formed in dies. The sheets forming the side and crown of the fire-boxes are provided with lianges C4 where they are riveted to the back wall of the boiler, and with iianges O3 at their front ends. Where the sectional or double construction is employed the front edges of the plates O C in front of the tube sheet or combustion chamber are lapped and riveted together as indicated at C5 in Fig. 3. The sides of theplates C are secured to the shell of the boiler by stays such in general character as are described and shown in my former patent; a Section of tubing F abutting against the walls of the sheet and boiler shell and a rivet E passing through the sheet and shell and through the tube, its heads E2 being riveted down on the insideof the fire-boX sheet and outside of the boiler shell. I-form these rivets, however, with central perforations E eX- tending in from each end (see Fig. 7.) and am enabled by this device to expand that portion of the rivet which passes through the metal sheets by introducing a conical tool into the perforation.

In case of a narrow iire-box such as that illustrated inFig. 6 the shape of the box and the boiler is such asto effectually resist the pressure tending to collapse the fire-box. Where a wider tire-box is required it can be 1 made sectional or double as illustrated in Figs. l, 2-and 3, the form of each section being `well adapted to resist collapsing strains, and

the inner walls C being united together by IOO stays F3 such as are used in uniting theshell to the boiler and the outer walls of the tire box. Where, however, as in the case illustrated in Figs. 4 and 5 the fire box is both broad and flared it is necessary that the crown should receive extraneous support. This of course can be with advantage-supplied to the other forms of fire-boxes, but I have illus-V trated it only in the construction shown in Figs. i and 5 where its advantage is most lobvious. I provide the necessary support by means of stays P secured at the their upper ends tothe shell of the boiler and at their lower ends to the seam formed by the abutting edges of the sheets forming the lire-box. i

G G are angle irons riveted to the .sides of the boiler and used to support stay rods II which .extend .across from side to .side above the lire box.; in my n-ew construction these stay reds extend through the lower cor-rugations of the atlanges forming th-e sea-m .and in 1 this position .are at the saine time well situated to resi-st the strains to which they are; subjected, and tar enough above the corru-E gated sheets not to interfere with their proper cleaning.

l., Fig. 1, indicates one of several braces uniting the tube and sides of the boiler with its back.

J is the tire door.

K K Figs. -4 and 5 indicate the grate bars or grat-e tubes and L indicates ta throat plate having a hangs L forming a seam with front i 4flange C3 of the lfire-box plates an-d vhaving -another tlange L2 form-ing a seam with a ila-nge M2 formed at the rear end of plates M which make up the combustion chamber in the con- This combustion lchamber l is mad-e 'of `corrugated sheets fof metal M M i at least two in num-ber and each pro-vided with flanges M where they abut togetherand struction shown..

have ,-a ilange M3 at their fron-t edges where they are unit-ed to th-e tube sheet N. Like the tire-box sheets, the flanges run ning across the corrugations are corrugated so :as to permit the cor-ru-g-ations of the different sheets to meet at the seams.

N are the tubes extending from the tube sheet.A The simplicity and strength of the tire box made from the corrugated sheets are of course obvious. I have sho-wn an opening M4 at the bottom of the lire box and a -chamber M5 extend-ing down from it through a tubular extension A4 of the boiler shell. The chamber .thus termed can be used to hold small particles of fuel, and may if desired,

"scares be provided with a grate so that these' fuel particles can be burned in it. j y

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

vl. In a boiler are-box having corrugated sheet metal walls and its crown formed by extending its walls in an arch shape and forming them with flan ges C2 where they abut and form a joint, said flanges following the corrugated outline of the sheets, so that the corrugations extend to and along the joint and an unbrokensurfaceis presented in the lfire-box.

2. In a boiler a tire-'box formed of two corrugated metal sheets, having flanges along their top edges forming a seam at the top of the fire-box crown 1the iianges following the corrugations 'of the plates so that the lcorrugations extend to and along the .seam andan .unbroken surface is presented in the nire-box substantially as specified.

.3. In a boiler the :combination of a boiler shell, a tire box havin-g corrugated walls and a crown formed by :extending said walls in an arch torni until they meet :and .forni a seam as described, and stay links P secured to .said seam inside the boiler rand to the boiler walls substantially as specihied..

i. In a boiler a combustion chamber M formed of metal plates eorrngated in the center and having hanged ledges M where they ,abut together, said flanged edges .following the cor-rugat-ions of .the plate wherebyan ,unbroken surface is presented substantially as and for the purpose :specifi-ed.

In a boiler the icornbination fof the tirebox `with a throat plate L formingseams with the rear ends of the -iirebox plates and having its rear edge Ilan-ged and acombustion chamber M termed of plates hanged as described to tor-m an Adamson sea-m with the rear dangle of the throat pla-te.

6. In a boiler the combination .of a :lire box formedof twocorrngated sheets bent to form the .sides and crown ef the lire-box and forining a seam along the crown :thereof with a combustion [cham-ber M formed of two xcerrugated sheets hang-.ed at M and .abutted to- .gether substantially as specified.

7. In a boiler ,a .eerrngatedjsheet metal tire- 'box, in combination with the boiler .shells yand stays E-EF uniti-ng the Yshell-s and the walls :of the tire-box, said stays eonsis-ting of tubes F against which the walls et the shell and lire-box rest and rivets E extending through said walls and having their heads E2 kformed with pertorations E substantially as and for the purpose specified.

8. In a boiler the combination with :the shell, of a fire box having its 4crow-n formed et' two corrugated sheets -o'f ymetal flanged where they meet .at the vcenter-,of the crown, said flanges being corrugated so .that the corru-gations Jextend. to and .along .the seam, and stay rods H secured to the shell of .the boiler and extending through the lower cor- IOC Iof

IIC

suitable tool is inserted in the perforations 1o E the rivet Will be expandedto fill the holes in the boiler Walls and heads E2 formed substantially as speoiied.

eno.4 s. sTRoNe.

Witnesses:

LEWIS R. DICK, FRANCIS T. CHAMBERs. 

